memstick: Constify struct memstick_device_id

'struct memstick_device_id' are not modified in these drivers.

Constifying this structure moves some data to a read-only section, so
increases overall security.

Update memstick_dev_match(), memstick_bus_match() and struct
memstick_driver accordingly.

On a x86_64, with allmodconfig, as an example:
Before:
======
text data bss dec hex filename
74055 3455 88 77598 12f1e drivers/memstick/core/ms_block.o

After:
=====
text data bss dec hex filename
74087 3423 88 77598 12f1e drivers/memstick/core/ms_block.o

Signed-off-by: Christophe JAILLET <[e-mail]>
Link: https://lore.kernel.org/r/6509d6f6ed[e-mail]
Signed-off-by: Ulf Hansson <[e-mail]>

drivers/memstick/core/memstick.c

···
 static DEFINE_SPINLOCK(memstick_host_lock);
 
 static int memstick_dev_match(struct memstick_dev *card,
-			      struct memstick_device_id *id)
+			      const struct memstick_device_id *id)
 {
 	if (id->match_flags & MEMSTICK_MATCH_ALL) {
 		if ((id->type == card->id.type)
···
 						 dev);
 	const struct memstick_driver *ms_drv = container_of_const(drv, struct memstick_driver,
 								  driver);
-	struct memstick_device_id *ids = ms_drv->id_table;
+	const struct memstick_device_id *ids = ms_drv->id_table;
 
 	if (ids) {
 		while (ids->match_flags) {

drivers/memstick/core/ms_block.c

···
 
 #endif /* CONFIG_PM */
 
-static struct memstick_device_id msb_id_tbl[] = {
+static const struct memstick_device_id msb_id_tbl[] = {
 	{MEMSTICK_MATCH_ALL, MEMSTICK_TYPE_LEGACY, MEMSTICK_CATEGORY_STORAGE,
 	 MEMSTICK_CLASS_FLASH},
 

drivers/memstick/core/mspro_block.c

···
 
 #endif /* CONFIG_PM */
 
-static struct memstick_device_id mspro_block_id_tbl[] = {
+static const struct memstick_device_id mspro_block_id_tbl[] = {
 	{MEMSTICK_MATCH_ALL, MEMSTICK_TYPE_PRO, MEMSTICK_CATEGORY_STORAGE_DUO,
 	 MEMSTICK_CLASS_DUO},
 	{}

include/linux/memstick.h

···
 };
 
 struct memstick_driver {
-	struct memstick_device_id *id_table;
+	const struct memstick_device_id *id_table;
 	int                       (*probe)(struct memstick_dev *card);
 	void                      (*remove)(struct memstick_dev *card);
 	int                       (*suspend)(struct memstick_dev *card,